Migration — Role in Allele Frequency & Natural Selection

There is a population of yellow snakes on an island. On the mainland, most snakes are red. You know that yellow scales is a recessive trait. On dry days, the red snakes are able to travel to the island, and the yellow snakes often make it to the mainland. You also know that a family of hawks on the island quickly eat red snakes. What can you conclude about the gene flow between these two populations?